Why did my iTunes song fail to convert?

Older iTunes purchases can be DRM-protected, and DRM removal is neither possible here nor something Filesvo will attempt. Unprotected M4As — voice memos, your own recordings, iTunes Plus purchases — convert without trouble.

Are my files uploaded?

No. The first time you use an audio/video tool, your browser downloads the open-source FFmpeg engine — a 32 MB file, roughly 10 MB once your connection compresses it — as a static file, and that is the only network traffic. Your media files are then processed entirely on your device and never reach a Filesvo server.

Does this work on phones?

Yes on recent devices, with limits: the engine is a 32 MB file (roughly 10 MB compressed in transit), and phones have less memory available to the browser, so large videos can fail on mobile. If a file fails on your phone, try a smaller file or a desktop browser. The 100 MB per-file limit applies everywhere.

Convert M4A to MP3 Online

M4A is Apple's default for voice memos and music, and while support is broad, plenty of car stereos, older devices and apps still want MP3. This tool re-encodes your M4A's AAC audio as a standard MP3 at the bitrate you choose.

or drag and drop a .m4a file here — up to 100 MB

This tool runs the open-source FFmpeg engine in your browser. First use downloads it once (a 32 MB file, roughly 10 MB compressed in transit); after that it loads from your browser cache. Your files are never uploaded. The engine is ffmpeg.wasm, distributed unmodified under the GPL-2.0-or-later.

Processed on your device — files are never uploaded to Filesvo.

How to use Filesvo

Select or drop an M4A file — a voice memo, song or recording.
Choose a bitrate; 192 kbps for music, 128 kbps is fine for voice.
Click Convert to MP3 and download.

About M4A-to-MP3 conversion

M4A files carry AAC audio in an MP4 container. AAC is actually the slightly better codec, so convert only when you need MP3's universal compatibility — and pick 192 kbps or higher to keep the second encoding generation inaudible.

DRM-protected tracks (older iTunes Store purchases marked 'Protected AAC') cannot be converted — the decoder will refuse them, and this tool reports that honestly instead of producing silence.

The FFmpeg command this runs

This tool is FFmpeg itself, compiled to WebAssembly and running in your browser. Below is the command it builds with the options set as they arrive — generated from the same code that performs the conversion, not written out by hand, so it cannot drift out of date. Paste it into a terminal with FFmpeg installed and it does the same job there.

ffmpeg -y -i input.m4a -vn -c:a libmp3lame -b:a 192k output.mp3

What each option on the tool changes in that command:

MP3 bitrate

128 kbps — smaller file — -b:a 128k

192 kbps — recommended — -b:a 192k

320 kbps — highest quality — -b:a 320k

The input and output names are placeholders. Your own filenames are used inside the browser, and neither file leaves your device.

Private by design

Your files are processed directly in your browser using the open-source FFmpeg engine compiled to WebAssembly and are not uploaded to Filesvo. Nothing is stored on our servers, because nothing ever reaches them.

The engine is a static file your browser downloads once and then caches — the only network request this tool makes. It is used exactly as its authors published it; see the engines and their licences.

Frequently asked questions

Why did my iTunes song fail to convert?: Older iTunes purchases can be DRM-protected, and DRM removal is neither possible here nor something Filesvo will attempt. Unprotected M4As — voice memos, your own recordings, iTunes Plus purchases — convert without trouble.
Are my files uploaded?: No. The first time you use an audio/video tool, your browser downloads the open-source FFmpeg engine — a 32 MB file, roughly 10 MB once your connection compresses it — as a static file, and that is the only network traffic. Your media files are then processed entirely on your device and never reach a Filesvo server.
Does this work on phones?: Yes on recent devices, with limits: the engine is a 32 MB file (roughly 10 MB compressed in transit), and phones have less memory available to the browser, so large videos can fail on mobile. If a file fails on your phone, try a smaller file or a desktop browser. The 100 MB per-file limit applies everywhere.

MP4 to MP3

Extract the audio track from an MP4 video as an MP3 file — entirely in your browser with the FFmpeg engine.

Compress Audio

Shrink MP3, WAV, M4A, OGG and FLAC files to a bitrate you choose, with honest before/after sizes.

WAV to MP3

Convert uncompressed WAV recordings into small, universal MP3 files at the bitrate you choose.